Organic 2 Review Problem 336

Organic 2 Review Problem 336 - 3 2o P RACTICAL ORGANIC C...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
3 2o PRACTICAL ORGANIC CHEMISTRY Sodium sulphanilate. —Burns with difficulty, leaving a residue of (chiefly) sodium sulphide. Add dil. HCl, and confirm without delay the evolution of H 2 S by means of a filter-paper moistened with lead acetate solution. Typical of salts of the sulphonic acids. Acetone sodium bisulphite. —Almost non-inflammable, leaving a colour- less residue of sodium sulphite and sulphate. Transfer residue to a test-tube, add dil. HCl, warm, and confirm the SO 2 evolved. Cane sugar. —Melts, darkens, then chars, and finally burns, with a marked odour of burnt sugar. Typical of the changes given by mono- and di-saccharides. Tartaric acid and tartrates also swell up, blacken and give an odour resembling burnt sugar. Citrates and lactates also char, and give off odours resembling burnt sugar. A large variety of organic compounds char without melting, e.g., starch, oxamide, sulphonic acids, uric acid, etc. NOTE, (i) Care should be taken to distinguish between a residue of carbon
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

Ask a homework question - tutors are online